The plural of instruction is instructions.
"Instruction" is standard noun derived from French derived from Latin. As with most words like this the plural is formed by adding an 's' on the end. The teacher gave his students the instructions needed to make a paper aeroplane.
There is no plural form. Do and Do not are verbs
The plural form of him, her, or it is them. (objective pronouns)
Bridges is the plural form of bridge.
The verb form of instruction is "instruct."
The plural form of "is" is "are."
The plural form of "I" is "we."
The plural form of "was" is "were."
"Groceries" is the plural form of "grocery."
"Beliefs" does not have a plural form, as it is already plural. Beliefs is the plural form of belief.
The plural form of mouth is mouths. The plural form of month is months. The Mounth is a range of hills in Scotland and does not have a plural form.
The plural form of the demonstrative pronoun 'that' is those.